00539nam a2200193 a 450000500170000002000180001708200150003510000280005024500420007825000130012026000370013330000330017050000700020360000080027363000220028163000300030385600060033385600060033920251222125947.0  a9781259064753  a004.6bFOR  aForouzan, Behrouz A.d_  aData communications and networkingb_  a5th ed.,  aChennaibMcGraw-Hillc2013-R2019  axxxviii, 1226 p.c24 cm.bPB  aIncludes bibliographical references and index.  18th reprint 2019  bc_  aComputer networks  aData transmission systems  f_  a_